[blooberr]

Sometimes its not the developer.

You can also blame it on an unrefined interview process. I've probably turned down the right candidates accidentally while trying to work out an interviewing system. With a startup, its hard to get enough feedback because you can't hire enough people to verify if your assumptions were correct.

Another issue to consider is unrealistic expectations for a candidate (has to know X, Y, Z frameworks + machine learning + mobile) If this candidate exists, you probably can't afford them.

For the rest of us, I strongly believe you can train most developers to do the job. It's how much time you're willing to invest in them. I've taken inexperienced developers that are very interested in the company vision and given them a chance to grow in the roles. After a year, they're the "good" developers I've always wanted.